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#pragma once

#ifndef __OPENCV_CUDEV_PTR2D_RESIZE_HPP__
#define __OPENCV_CUDEV_PTR2D_RESIZE_HPP__

#include "opencv2/core/base.hpp"
#include "../common.hpp"
#include "../grid/copy.hpp"
#include "traits.hpp"
#include "gpumat.hpp"

namespace cv { namespace cudev {

template <class SrcPtr> struct ResizePtr
{
    typedef typename PtrTraits<SrcPtr>::value_type value_type;
    typedef typename PtrTraits<SrcPtr>::index_type index_type;

    SrcPtr src;
    float fx, fy;

    __device__ __forceinline__ typename PtrTraits<SrcPtr>::value_type operator ()(typename PtrTraits<SrcPtr>::index_type y, typename PtrTraits<SrcPtr>::index_type x) const
    {
        const float yn = static_cast<float>(y * fy);
        const float xn = static_cast<float>(x * fx);

        return src(yn, xn);
    }
};

template <class SrcPtr> struct ResizePtrSz : ResizePtr<SrcPtr>
{
    int rows, cols;

    template <typename T>
    __host__ void assignTo(GpuMat_<T>& dst, Stream& stream = Stream::Null()) const
    {
        gridCopy(*this, dst, stream);
    }
};

template <class SrcPtr>
__host__ ResizePtrSz<typename PtrTraits<SrcPtr>::ptr_type> resizePtr(const SrcPtr& src, float fx, float fy)
{
    ResizePtrSz<typename PtrTraits<SrcPtr>::ptr_type> r;
    r.src = shrinkPtr(src);
    r.fx = 1.0f / fx;
    r.fy = 1.0f / fy;
    r.rows = cv::saturate_cast<int>(getRows(src) * fy);
    r.cols = cv::saturate_cast<int>(getCols(src) * fx);
    return r;
}

template <class SrcPtr> struct PtrTraits< ResizePtrSz<SrcPtr> > : PtrTraitsBase<ResizePtrSz<SrcPtr>, ResizePtr<SrcPtr> >
{
};

}}

#endif
